{
  "id": 79595,
  "title": "The mysterious 2018, 2, 1",
  "url": "/competitions/elo-merchant-category-recommendation/discussion/79595",
  "author_name": "LiwenHuang",
  "post_date": "2019-02-05T20:58:14.007000",
  "votes": 1,
  "comment_count": 3,
  "views": 0,
  "content": "<p>I have noticed that many folks are using this date to make elapse variable. But where did they get this date from, anybody knows?</p>\n\n<p>I have looked at the max of purchase date (which is month_lag is referencing) in the history dataset, seems like 2018, 2, 1 is not the majority of the last purchase date  some claimed </p>\n\n<p>Here is the frequency plot of the the last purchase dates in the history dataset</p>",
  "messages": [
    {
      "id": 466709,
      "postDate": "2019-02-05T20:58:14.007Z",
      "content": "<p>I have noticed that many folks are using this date to make elapse variable. But where did they get this date from, anybody knows?</p>\n\n<p>I have looked at the max of purchase date (which is month_lag is referencing) in the history dataset, seems like 2018, 2, 1 is not the majority of the last purchase date  some claimed </p>\n\n<p>Here is the frequency plot of the the last purchase dates in the history dataset</p>",
      "rawMarkdown": "I have noticed that many folks are using this date to make elapse variable. But where did they get this date from, anybody knows?\n\nI have looked at the max of purchase date (which is month_lag is referencing) in the history dataset, seems like 2018, 2, 1 is not the majority of the last purchase date  some claimed \n\nHere is the frequency plot of the the last purchase dates in the history dataset",
      "votes": 1
    },
    {
      "id": 466948,
      "postDate": "2019-02-06T08:47:09.993Z",
      "content": "<p>it is date when evaluation period starts. We have negative month lag for historical transactions and positive for new merchant transaction. So , in principle you can take ref data as latest purchase in historical transactions(not always).</p>",
      "rawMarkdown": "it is date when evaluation period starts. We have negative month lag for historical transactions and positive for new merchant transaction. So , in principle you can take ref data as latest purchase in historical transactions(not always).",
      "replies": [
        {
          "id": 467854,
          "postDate": "2019-02-07T21:07:38.017Z",
          "content": "<p>what do you mean by (not always)? there are ref dates that are not the last purchase_date in historical transaction?</p>",
          "rawMarkdown": "what do you mean by (not always)? there are ref dates that are not the last purchase_date in historical transaction?"
        }
      ]
    },
    {
      "id": 466791,
      "postDate": "2019-02-05T23:44:49.663Z",
      "rawMarkdown": "",
      "isDeleted": true
    }
  ],
  "comments": [
    {
      "id": 466948,
      "author_name": "Salamat",
      "author_url": "",
      "post_date": "2019-02-06T08:47:09.993000",
      "content": "<p>it is date when evaluation period starts. We have negative month lag for historical transactions and positive for new merchant transaction. So , in principle you can take ref data as latest purchase in historical transactions(not always).</p>",
      "votes": 0,
      "replies": [
        {
          "id": 467854,
          "author_name": "samshipengs",
          "author_url": "",
          "post_date": "2019-02-07T21:07:38.017000",
          "content": "<p>what do you mean by (not always)? there are ref dates that are not the last purchase_date in historical transaction?</p>",
          "votes": 0,
          "replies": []
        }
      ]
    },
    {
      "id": 466791,
      "author_name": "",
      "author_url": "",
      "post_date": "2019-02-05T23:44:49.663000",
      "content": "",
      "votes": 0,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "466709": "I have noticed that many folks are using this date to make elapse variable. But where did they get this date from, anybody knows?\n\nI have looked at the max of purchase date (which is month_lag is referencing) in the history dataset, seems like 2018, 2, 1 is not the majority of the last purchase date  some claimed \n\nHere is the frequency plot of the the last purchase dates in the history dataset",
    "466948": "it is date when evaluation period starts. We have negative month lag for historical transactions and positive for new merchant transaction. So , in principle you can take ref data as latest purchase in historical transactions(not always).",
    "466791": ""
  }
}